Trapezoidal strong back beam system

ABSTRACT

A trapezoidal strong back beam system for securing a bridge crane to a structure. The trapezoidal strong back beam system has at least one guide attachable to a support structure, at least one carriage associated with the guide and moveable along the length of the guide, a bridge beam attachable to the carriage, and at least one attachment means associated with the guide track of the bridge beam. The bridge beam has a guide track and a trapezoidal beam attached to the guide track. The guide track is attachable to the carriage. The attachment means is adapted to support a lifting device. The trapezoidal beam has a top section, a first side rigidly secured to the top section, and a second side rigidly secured to the top section opposite the first side. The first and second sides taper inwardly toward each other from the top section to the guide track.

CROSS REFERENCE TO RELATED APPLICATION

This patent application is related to the following commonly owned pending United States Patent Application: U.S. Patent Application titled, “Crane Assembly,” Ser. No. 10/867,719, filed Jun. 16, 2004, by Douglas McGregor McKay, the disclosure of which is hereby incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a trapezoidal strong back beam system for use in connection with manual bridge cranes. The trapezoidal strong back beam system has particular utility in connection with manually operated suspended bridge crane assemblies and lifting devices. However, it will be appreciated that the present invention has broader application and is not limited to that particular use.

2. Description of the Prior Art

Trapezoidal strong back beam system systems are desirable for bridge crane designs because they allow for the bridge weight to be reduced compared with using rectangular hollow section (RHS) structural beams.

The use of trapezoidal beams is known in the prior art. For example: U.S. Pat. No. 6,868,646; U.S. Pat. No. 6,574,818; U.S. Pat. No. 2,336,622; U.S. Pat. No. 5,426,906; U.S. Pat. No. 6,189,854; U.S. Pat. No. 1,552,474; U.S. Pat. No. 4,610,117; U.S. Pat. No. 2,367,291; and U.S. Pat. No. 3,708,937.

Existing suspended crane assemblies generally include a crane, which is suspended from a trolley that is, in turn, suspended from at least one bridge. The trolley is capable of longitudinal movement along the at least one bridge. The at least one bridge is movably supported at either end from a pair of parallel tracks or guides. The tracks or guides are generally mounted to a building ceiling or roof structure. Alternatively, the tracks or guides (hereinafter referred to simply as “guides”) could be supported from a steel superstructure. This is a particularly attractive option in situations where the building ceiling or roof structure concerned is not designed to bear loads.

One problem with existing suspended crane assemblies and bridge beams is there lack of ability to allow for the design of bridges with reduced weight and with comparable strength to RHS beams or other standard structural beams. Reducing the weight of the bridges will allow for easier installation and operation, and reduce the overall cost of manufacture. Additionally, the reduced weight of the bridges will reduce the stress and load on the structure of which the trapezoidal strong back beam system is attached to.

While the above-described devices fulfill their respective, particular objectives and requirements, the aforementioned patents do not describe a trapezoidal strong back beam system that allows for reduced weight of manually operated suspended bridge crane assemblies.

Therefore, a need exists for a new and improved trapezoidal strong back beam system that can be used for manually operated suspended bridge crane assemblies. In this regard, the present invention substantially fulfills this need. In this respect, the trapezoidal strong back beam system according to the present invention substantially departs from the conventional concepts and designs of the prior art, and in doing so provides an apparatus primarily developed for the purpose of manually operated suspended bridge crane assemblies.

SUMMARY OF THE INVENTION

In view of the foregoing disadvantages inherent in the known types of trapezoidal beams now present in the prior art, the present invention provides an improved trapezoidal strong back beam system, and overcomes the above-mentioned disadvantages and drawbacks of the prior art. As such, the general purpose of the present invention, which will be described subsequently in greater detail, is to provide a new and improved trapezoidal strong back beam system and method which has all the advantages of the prior art mentioned heretofore and many novel features that result in a trapezoidal strong back beam system which is not anticipated, rendered obvious, suggested, or even implied by the prior art, either alone or in any combination thereof.

To attain this, the present invention essentially comprises at least one guide attachable to a support structure, at least one carriage associated with the guide and moveable along the length of the guide, a bridge beam attachable to the carriage, and at least one attachment means associated with the guide track of the bridge beam. The bridge beam has a guide track and a trapezoidal beam attached to the guide track. The guide track is attachable to the carriage. The attachment means is adapted to support a lifting device. The trapezoidal beam has a top section, a first side rigidly secured to the top section, and a second side rigidly secured to the top section opposite the first side. The first and second sides taper inwardly toward each other from the top section to the guide track.

Alternately, the top section has a first top section rigidly secured to the first side, and a second top section rigidly secured to the second side, wherein the first top section is rigidly secured to the second top section in a generally overlapping manner.

Additionally, the bridge beam can be constructed with only the trapezoidal beam, wherein the trapezoidal beam features a first flange extending from the first beam opposite the top section, and a second flange extending from the second beam opposite the top section. The first and second flanges are orientated toward each other. The configuration of the first and second flanges, and the first and second sides allow for a bridge crane component to be received therein. There has thus been outlined, rather broadly, the more important features of the invention in order that the detailed description thereof that follows may be better understood and in order that the present contribution to the art may be better appreciated.

The invention may also include a plurality of diaphragm stiffeners and a lifting assembly, wherein the stiffeners are inserted into the interior of the first and second sides. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject matter of the claims attached.

It is to be appreciated that the assembly does not include the lifting device, or part thereof. The inclusion of the lifting device in the discussion of the present invention is merely provided to define the context of the invention.

Numerous objects, features and advantages of the present invention will be readily apparent to those of ordinary skill in the art upon a reading of the following detailed description of presently preferred, but nonetheless illustrative, embodiments of the present invention when taken in conjunction with the accompanying drawings. In this respect, before explaining the current embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of descriptions and should not be regarded as limiting.

As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.

It is therefore an object of the present invention to provide a new and improved trapezoidal strong back beam system that has all of the advantages of the prior art trapezoidal beams and none of the disadvantages.

It is another object of the present invention to provide a new and improved trapezoidal strong back beam system that may be easily and efficiently manufactured and marketed.

An even further object of the present invention is to provide a new and improved trapezoidal strong back beam system that has a low cost of manufacture with regard to both materials and labor, and which accordingly is then susceptible of low prices of sale to the consuming public, thereby making such trapezoidal strong back beam system economically available to the buying public.

Still another object of the present invention is to provide a new trapezoidal strong back beam system that provides in the apparatuses and methods of the prior art some of the advantages thereof, while simultaneously overcoming some of the disadvantages normally associated therewith.

Lastly, another object of the present invention is to provide a trapezoidal strong back beam system for manually operated suspended bridge crane assemblies. This allows for a reduced bridge weight when compared with using RHS beams as a strong back beam.

The present invention has been found to at least reduce the incidence of jamming experienced by existing assemblies. Additionally, the present invention also has been found to require less operator effort to initiate movement of the bridge along parallel trapezoidal strong back beams when compared to existing assemblies.

Moreover, the present invention is particularly useful, because it can be relatively easily incorporated into existing assemblies.

These together with other objects of the invention, along with the various features of novelty that characterize the invention, are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and the specific objects attained by its uses, reference should be had to the accompanying drawings and descriptive matter in which there are illustrated preferred embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be better understood and objects other than those set forth above will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:

FIG. 1 is a perspective view of the trapezoidal strong back beam system constructed in accordance with the principles of the present invention.

FIG. 2 is a side view of the trapezoidal strong back beam system of the present invention.

FIG. 3 is a cross-sectional view of the trapezoidal strong back beam system of the present invention taken along line 3 in FIG. 2.

FIG. 4 is a cross-sectional view of the trapezoidal strong back beam system of the present invention taken along line 4 in FIG. 3.

FIG. 5 is a perspective view of an alternate embodiment of the trapezoidal strong back beam system of the present invention.

FIG. 6 is a front view of an alternate embodiment of the trapezoidal strong back beam system of the present invention.

FIG. 7 is a perspective view of an alternate embodiment of the trapezoidal strong back beam system of the present invention.

FIG. 8 is a partial cross-sectional view of an alternate embodiment of the trapezoidal strong back beam system of the present invention illustrated in FIG. 7.

FIG. 9 is a partial cross-sectional view of the alternate embodiment of the trapezoidal strong back beam system of the present invention taken along line 9 in FIG. 8.

FIG. 10 is a partial cross-sectional view of an alternate embodiment of the trapezoidal strong back beam system of the present invention illustrated in FIG. 9.

FIG. 11 is a partial cross-sectional view of the alternate embodiment of the trapezoidal strong back beam system of the present invention taken along line 11 in FIG. 9.

FIG. 12 is a partial cross-sectional view of an alternate embodiment of the trapezoidal strong back beam system of the present invention illustrated in FIG. 11.

FIG. 13 is a perspective view of an alternate embodiment of the trapezoidal strong back beam system of the present invention.

FIG. 14 is a partial cross-sectional view of the alternate embodiment of the trapezoidal strong back beam system of the present invention taken along line 14 in FIG. 11.

FIG. 15 is a partial cross-sectional view of the alternate embodiment of the trapezoidal strong back beam system of the present invention taken along line 15 in FIG. 14.

The same reference numerals refer to the same parts throughout the various figures.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now to the drawings, and particularly to FIGS. 1-15 an embodiment of the trapezoidal strong back beam system of the present invention is shown and generally designated by the reference numeral 10.

In FIG. 1, a new and improved trapezoidal strong back beam system 10 of the present invention for reducing the weight of bridge cranes is illustrated and will be described. More particularly, the trapezoidal strong back beam system 10 has a trapezoidal beam 12, a guide track 30, and an end cap 26. The trapezoidal beam 12 includes a first side 14 and a second side 20 having overlapping top sections that are rigidly secured to each other through means such as, but not limited to, welds along their edges or seams, rivets, fasteners, adhesives, or clamps. The guide track 30 is attached to the end opposite the overlapping top sections. The end cap 26 is attached to the first and second sides 14, 20 above the guide track 30, so as to cover the first and second sides 14, 20 and their overlapping top sections.

The guide track 30 has an opening 34, and is an open channel beam, preferably a C-section beam. The guide track 30 and opening 34 are adapted to receive a bridge crane component. The guide track 30 is made of a metal, but any other material having similar strength can be used, such as composites, or alloys.

As illustrated in FIG. 2, the trapezoidal beam 12 has a plurality of diaphragm stiffeners 40 that are attached to the interior of the trapezoidal beam 12 and spaced incrementally along its longitudinal length. The trapezoidal beam 12 is attachable, preferably rigidly secured to a support structure 13, which can be a building ceiling, roof, separate superstructure, or a support frame. The trapezoidal beam 12 is made of a metal, but any other material having similar strength can be used, such as composites, or alloys.

The guide track 30 can extend past the trapezoidal beam 12 so as to be able to connect to additional guide tracks 30 through a guide track coupler 38.

Referring now to FIG. 3, the trapezoidal beam 12 further includes a top section 16 adjacent the first and second sides 14, 20, a first flange 18 opposite the top section 16 of the first side 14, and a second flange 24 opposite the top section 16 of the second side 20. The top section 16 is rigidly secured to the first and second sides 14, 20 along their entire lengths. The first and second sides 14, 20 taper inwardly from the top section 16 to their respective flanges 18, 24. The angle at which the first and second sides 14, 20 taper relate to the height of the trapezoidal beam 12 and the width of the guide track 30.

Alternatively, the trapezoidal beam 12 can include a first top section 22 adjacent the first side 14, a second top section 22′ adjacent the second side 20, a first flange 18 opposite the first top section 22 of the first side 14, and a second flange 24 opposite the second top section 22′ of the second side 20. The first and second top sections 22, 22′ are oriented parallel and adjacent to each other, so as to produce a flush contact along their entire length. The first and second sides 14, 20 taper inwardly from their respective top sections 22, 22′ to their respective flanges 18, 24. The angle at which the first and second sides 14, 20 taper relate to the height of the trapezoidal beam 12 and the width of the guide track 30. The first top section 22 is placed above the second top section 22′ so as to leave a gap between the edges of the first and second top sections 22, 22′ and the first and second sides 14, 20. Thereby allowing for the first and second top sections 22, 22′ to be rigidly fixed together, such as by, but limited to, welding along the first and second top sections 22, 22′ edges.

The guide track 30 has sides 32, and a top portion 36 adjacent to the sides 32, thereby producing an open channel beam.

The first and second flanges 18, 24 extend down from the first and second sides 14, 20 so as to receive the sides 32 of guide track 30. The first and second flanges 18, 24 are rigidly fixed to the sides 32, such as by, but not limited to, welding along the first and second flanges 18, 24 edges.

The diaphragm stiffeners 40 are configured to correspond to the interior shape of the trapezoidal beam 12, thereby allowing the diaphragm stiffeners 40 to be securely inserted therein. The diaphragm stiffeners 40 each have chamfered top corners 42, and a centrally located opening 44. The chamfered top corners 42 are configured to receive the edge of the first or second top sections 22, 22′, depending on the orientation of the top sections. The bottom section of the diaphragm stiffeners 40 are configured to abut against the top portion 36 of the guide track 30. The diaphragm stiffeners 40 are rigidly fixed to the interior of the trapezoidal beam 12, and the top portion 36 of the guide track 30.

It is to be appreciated that the diaphragm stiffeners 40 increase the strength and rigidity of the trapezoidal strong back beam system 10.

As best illustrated in FIG. 4, the guide track coupler 38 has a shape that corresponds to that of guide track 30 and which is larger so as to allow the guide track coupler 38 to slide over the guide track 30. Thereby allowing an additional guide track 30 to be inserted in the free end of the guide track coupler 38, as best illustrated in FIGS. 2 and 4. The guide track coupler 38 is rigidly fixed to both ends of the guide tracks 30 inserted therein.

Additionally, the guide track coupler 38 can be configured to the shape of guide track 30 but which is smaller in size so as to allow the guide track coupler 38 to be inserted into two adjoining guide tracks 30 (not illustrated).

It is appreciated that the guide track 30, as described above, can be adapted to receive through the opening 34 a carriage, trolley, traveling crane, or any other traveling crane or bridge crane component.

An alternate embodiment trapezoidal strong back beam system 50 is illustrated in FIG. 5. The alternate embodiment trapezoidal strong back beam system 50 has a first side 54, a second side 60, and a top section 56 that is rigidly secured to the first and second sides 54, 60 through means such as, but not limited to, welds along their flange seams, rivets, fasteners, adhesives, or clamps.

Alternatively, the trapezoidal strong back beam system 50 can include a first top section 62 adjacent the first side 54, a second top section 62′ adjacent the second side 60, a first flange 58 opposite the first top section 62 of the first side 54, a second flange 64 opposite the second top section 62′ of the second side 60, and an opening 66 between the first and second flanges 58, 64. The first and second top sections 62, 62′ are oriented parallel and adjacent to each other, so as to produce a flush contact along their entire length. The first top section 62 is placed above the second top section 62′ so as to leave a gap between the edges of the first and second top sections 62, 62′ and the first and second sides 54, 60. Thereby allowing for the first and second top sections 62, 62′ to be rigidly fixed together, such as by, but limited to, welding along the edges of the first and second sides 54, 60.

Additionally, diaphragm stiffeners (not illustrated) can be inserted into the trapezoidal strong back beam system 50 in a way so as to leave a space between the bottom of the stiffener and the first and second flanges 58, 64.

The first and second flanges 58, 64 are angled inwardly toward each other. Preferably, the angle orientates the first and second flanges 58, 64 parallel with the top section 56, as best illustrated in FIG. 6. This first flange 58, second flange 64 and opening 66 configuration substantially produces a guide or track system adapted to receive a carriage, trolley, or traveling crane or bridge crane component.

The first and second sides 54, 60 taper inwardly from the top section 56 to their respective flanges 58, 64. The angle at which the first and second sides 54, 60 taper relate to the desired width of the opening 66.

It is appreciated that the alternate embodiment trapezoidal strong back beam system 50, as described above, produces a combination trapezoidal beam and guide track which can be adapted to receive through the opening 66 a carriage, trolley, traveling crane, or any other traveling crane or bridge crane component.

FIG. 7 illustrates another alternate embodiment trapezoidal strong back beam system 70, which includes a lifting assembly. A lifting device in the form of a manually operated crane (not illustrated) may be suspended from the lifting assembly by attachment means 76. The attachment means 76 could be a hook, chain or other suitable device. It is to be appreciated, that the lifting device could adopt any suitable form. For example, the lifting device could be a manually or an electrically operated crane.

The attachment means 76 is connected to a trolley 78. The trolley 78 is movably suspended from a bridge 72, which can have a similar configuration to the guide track 30. Additionally, the bridge 72 could be in the form of an open channel section, an I-beam, or any other suitable form. The trolley 78 includes trolley rollers being wheels, ball bearings or other suitable propulsion means. The rollers are capable of rolling longitudinally along the bridge 72. The trolley rollers could adopt any suitable form. In this respect, the trolley rollers could include plastic coated rolling surfaces for silent running. Alternatively, the rollers, including the roller surfaces, could be constructed from steel. Alternatively other mechanisms could be used in place of rollers, such that the trolley 78 is movable along the length of the bridge 72.

The attachment means 76 extends through an opening 74 provided in the underside of the bridge 72. In this way the attachment means 76 and crane are movable along the length of the bridge 72. Where the bridge does not have a slot, the attachment means 76 is connected to the trolley 78 or bridge 72.

It is to be appreciated that the attachment means 76 could be movably connected to two or more bridges 72.

Two substantially parallel trapezoidal strong back beam systems 10 are provided. The bridge 72 is movable longitudinally relative to the parallel guide tracks 30 of the trapezoidal strong back beam systems 10. In the illustrated embodiment of the invention, the bridge 72 is manually movable relative to the parallel guide tracks 30. Again, however, it is to be appreciated that the bridge 72 could be electrically movable relative to the parallel guide tracks 30.

The parallel guide tracks 30 of the trapezoidal strong back beam systems 10 as shown are formed from an open channel C-section which are respectively provided with openings 34.

In the illustrated embodiment the parallel guide tracks 30 are each rigidly secured to the first and second flanges 18, 24 of the trapezoidal beams 12, thereby forming the trapezoidal strong back beam system 10 in which the lifting assembly is attached to thereby producing the alternate embodiment trapezoidal strong back beam system 70, as best illustrated in FIG. 9. The top section 16 of the trapezoidal beams 12 is then rigidly secured to a building ceiling, roof or separate superstructure. However, it is to be appreciated that the parallel guide tracks 30 could be provided with some movement relative to their mountings, if desired. End caps 26 are rigidly secured to the ends of the trapezoidal beams 12 so as to cover the first and second sides 14, 20 and the top section 16.

It can be appreciated the guide track couplers 38 can be attached to the ends of the guide tracks 30 so as to allow for the attachment of additional guide tracks 30 to the alternate embodiment trapezoidal strong back beam system 70.

The bridge 72 includes carriages 80. The carriages 80 are provided for traveling along the parallel guide tracks 30 respectively. The relationship and configuration of the carriages 80 and the guide tracks 30 are substantially identical. Therefore, the following description, with reference to FIGS. 8 and 9, in part, refers only to one carriage 80 and guide track 30. Additionally, the carriages 80 can be motorized or provided with a motor and drive system.

The parallel guide tracks 30 of the trapezoidal strong back beam system 10 are illustrated in FIGS. 7, 8 and 9 as being open channels in profile, and therefore include an internal track system. The trapezoidal beams 12 each include a plurality of diaphragm stiffeners 40 rigidly secured therein. It is to be appreciated, however, that the guide tracks 30 could adopt other suitable profiles, including I-beam (or external track) profiles (not illustrated).

The carriage 80, or similar device, is movable along the parallel guide tracks 30 of the trapezoidal strong back beam system 10, and includes at least one mounting plate 82. The mounting plate 82 is configured to travel longitudinally along the parallel guide track 30 by way of rollers 84, 86, 88, 90 which are rotatably mounted to the mounting plate 82. The carriages 80 bear the weight of the bridge 72 and the crane (not illustrated), which is, in turn, borne by the parallel guide tracks 30. An additional mounting plate 82 may be used external of the profile (I-beam).

Preferably, the rollers 84, 86, 88, 90 include tapered surfaces thereby enabling the rollers 84, 86, 88, 90 to roll efficiently along the guide tracks 30. The rollers 84, 86, 88, 90 include plastic (or rubber) coated rolling surfaces. The plastic coated rolling surfaces are provided to reduce rolling noise of the rollers 84, 86, 88, 90. It is to be appreciated, however, that the rollers 84, 86, 88, 90 need not include plastic coated rolling surfaces. The rollers 84, 86, 88, 90 could instead include, for example, steel rolling surfaces.

Furthermore, it is to be appreciated that the rollers 84, 86, 88, 90 could be replaced by another suitable arrangement such as, for example, a bearing arrangement.

Existing crane assemblies tend to jam when an operator initiates movement of the bridge along the assembly guides. This is, in part, a result of the rigid connection in existing crane assemblies of the bridge to the carriage.

To address this problem, the present invention includes a displacement arm 82. The displacement arm 92 is constructed from mild steel, or higher-grade steel, generally from steel plate or steel strip. Alternatively, the displacement arm 92 could be constructed from any other suitable material. The displacement arm 92 is pivotally connected to a sleeve 94. The sleeve 94 is rigidly fastened (by any suitable means) to the mounting plate 82. The mounting plate 82 is preferably welded to the sleeve 94, but other means of rigid attachment such as bolting could be used. The pivotal connection between the displacement arm 92 and the sleeve 94 is by way of a ball bearing 96. The ball bearing 96 is retained in place by a ball bearing seat 98 provided in the displacement arm 92 and the sleeve 94, respectively. The ball bearing 96 could be manufactured from any suitable grade of steel, or any other suitable material. The bearing seat is formed from a plastic, such as nylon, to minimize friction, but could be formed from other suitable materials.

The displacement arm 92 is pivotally connected to a bridge sleeve 100, as illustrated in FIGS. 8 and 9, which, in turn, is securely connected to one end of the bridge 72. The bridge sleeve 100 is constructed from steel. Any suitable grade steel, or any other material, could be used in the construction of the bridge sleeve 100. The displacement arm 92 is pivotally connected to the bridge sleeve 100 by two fasteners 102, 104 via displacement arm appendages 106, 108. The fasteners 102, 104 provide a pivotal connection between the displacement arm 92 and the bridge sleeve 100.

The above arrangement forms a universal joint that provides the necessary relative pivoting and lateral movement between the carriage 80 and the bridge 72 to at least reduce the incidence of jamming of the alternate embodiment trapezoidal strong back beam system 70, upon initiating movement of the bridge 72 relative to the parallel guide tracks 30 of the trapezoidal strong back beam systems 10.

It is to be appreciated that the pivotal connection of the carriages 80 to the bridge 72 could adopt a configuration(s) different to that specifically described above. The pivotal connection could, instead, include a rod end, or other pivotal or rotatable linkage arrangement.

The mounting plate 82 includes a safety mechanism in the form of anti-derailment means 82A, 82B. The anti-derailment means 82A, 82B are ball bearings or similar, which ensure the carriages 80 remain engaged with the guide tracks 30 of the trapezoidal strong back beam system 10. The anti-derailment means 82A, 82B are provided to prevent the bridge 72 and crane crashing to the ground in the event of failure of the rollers 84, 86, 88, 90 or other parts of the carriage 80.

The bridge 72 and the parallel guide tracks 30 are formed from cold-rolled steel in tube or bar. It can also be appreciated that the bridge 72 can be in the form of trapezoidal beam system 10, 50, thereby form forming a trapezoidal beam bridge 72′, as best illustrated in FIGS. 9 and 10. Bridge 72 can consist of trapezoidal beam 12, and guide track 30, wherein the portion of guide track 30 that extends past trapezoidal beam 12 is received in the bridge sleeve 100.

Referring now to FIG. 10, which illustrates another alternate embodiment trapezoidal strong back beam system 120. The alternate embodiment trapezoidal strong back beam system 120 is similar to the alternate embodiment trapezoidal strong back beam system 70 of FIG. 7 except that the parallel guide tracks 30 and the trapezoidal beams 12 of the alternate embodiment trapezoidal strong back beam system 70 are replaced with parallel alternate embodiment trapezoidal beams 50 of FIGS. 5 and 6.

The trapezoidal beam 50 has a first side 54, a top section 56, a first flange 58, a second side 60, and a second flange 64. The top section 56 is rigidly secured to the first and second sides 54, 60 through means such as, but not limited to, welds along their flange seams, rivets, fasteners, adhesives, or clamps.

The top section 56 is adjacent the first side 54 and the second side 60. The first flange 58 is opposite of the top section 56 of the first side 54, and the second flange 64 is opposite the top section 56 of the second side 60. An opening 66 is defined between the first and second flanges 58, 64.

The first and second flanges 58, 64 are angled inwardly toward each other. Preferably, the angle orientates the first and second flanges 58, 64 parallel with the top section 56, as best illustrated in FIG. 10.

The first and second sides 54, 60 taper inwardly from the top sections 56 to their respective flanges 58, 64. The angle at which the first and second sides 54, 60 taper relate to the desired width of the opening 66.

The bridge 72 includes carriages 80. The carriages 80 are provided for traveling along the first and second flanges 58, 64 of the alternate embodiment trapezoidal strong back beam system 50 respectively. The relationship and configuration of the carriages 80 and the first and second flanges 58, 64 are substantially identical. Therefore, the following description, with reference to FIG. 10, in part, refers only to one carriage 80 and the first and second flanges 58, 64 of a single alternate embodiment trapezoidal strong back beam system 50. Additionally, the carriages 80 can be motorized or provided with a motor and drive system.

The first and second flanges 58, 64 of the alternate embodiment trapezoidal strong back beam system 50 forms an internal track system. The alternate embodiment trapezoidal strong back beam system 50 can each include a plurality of diaphragm stiffeners 40 rigidly secured therein (not illustrated). It is to be appreciated, however, that the first and second flanges 58, 64 could adopt other suitable profiles, including I-beam, or external track profiles (not illustrated).

The carriage 80, or similar device, is movable along the first and second flanges 58, 64 of the trapezoidal strong back beam system 50, and includes at least one mounting plate 82. The mounting plate 82 is configured to travel longitudinally along the first and second flanges 58, 64 by way of rollers 84, 86, 88, 90, which are rotatably mounted to the mounting plate 82. The carriages 80 bear the weight of the bridge 72 and the crane (not illustrated), which is, in turn, borne by the first and second flanges 58, 64 of the trapezoidal strong back beam system 50. An additional mounting plate 82 may be used external of the profile (I-beam).

Preferably, the rollers 84, 86, 88, 90 include tapered surfaces thereby enabling the rollers 84, 86, 88, 90 to roll efficiently along the first and second flanges 58, 64. The rollers 84, 86, 88, 90 include plastic (or rubber) coated rolling surfaces. The plastic coated rolling surfaces are provided to reduce rolling noise of the rollers 84, 86, 88, 90. It is to be appreciated, however, that the rollers 84, 86, 88, 90 need not include plastic coated rolling surfaces. The rollers 84, 86, 88, 90 could instead include, for example, steel rolling surfaces.

Furthermore, it is to be appreciated that the rollers 84, 86, 88, 90 could be replaced by another suitable arrangement such as, for example, a bearing arrangement.

Existing crane assemblies tend to jam when an operator initiates movement of the bridge along the assembly guides. This is, in part, a result of the rigid connection in existing crane assemblies of the bridge to the carriage.

To address this problem, this alternate embodiment of the present invention includes a displacement arm 82. The displacement arm 92 is constructed from mild steel, or higher-grade steel, generally from steel plate or steel strip. Alternatively, the displacement arm 92 could be constructed from any other suitable material. The displacement arm 92 is pivotally connected to a sleeve 94. The sleeve 94 is rigidly fastened (by any suitable means) to the mounting plate 82. The mounting plate 82 is preferably welded to the sleeve 94, but other means of rigid attachment such as bolting could be used. The pivotal connection between the displacement arm 92 and the sleeve 94 is by way of a ball bearing 96. The ball bearing 96 is retained in place by a ball bearing seat 98 provided in the displacement arm 92 and the sleeve 94, respectively. The ball bearing 96 could be manufactured from any suitable grade of steel, or any other suitable material. The bearing seat is formed from a plastic, such as nylon, to minimize friction, but could be formed from other suitable materials.

The displacement arm 92 is pivotally connected to a bridge sleeve 100, as illustrated in FIG. 10, which, in turn, is securely connected to one end of the bridge 72. The bridge sleeve 100 is constructed from steel. Any suitable grade steel, or any other material, could be used in the construction of the bridge sleeve 100. The displacement arm 92 is pivotally connected to the bridge sleeve 100 by two fasteners 102, 104 via displacement arm appendages 106, 108. The fasteners 102, 104 provide a pivotal connection between the displacement arm 92 and the bridge sleeve 100.

The above arrangement forms a universal joint that provides the necessary relative pivoting and lateral movement between the carriage 80 and the bridge 72 to at least reduce the incidence of jamming of the alternate embodiment lifting assembly 120, upon initiating movement of the bridge 72 relative to the first and second flanges 58, 64 of the alternate embodiment trapezoidal strong back beam system 50.

It is to be appreciated that the pivotal connection of the carriages 80 to the bridge 72 could adopt a configuration(s) different to that specifically described above. The pivotal connection could, instead, include a rod end, or other pivotal or rotatable linkage arrangement.

The mounting plate 82 includes a safety mechanism in the form of anti-derailment means 82A, 82B. The anti-derailment means 82A, 82B are ball bearings or similar, which ensure the carriages 80 remain engaged with the first and second flanges 58, 64 of the alternate embodiment trapezoidal strong back beam system 50. The anti-derailment means 82A, 82B are provided to prevent the bridge 72 and crane crashing to the ground in the event of failure of the rollers 84, 86, 88, 90 or other parts of the carriage 80.

It can also be appreciated that the bridge 72 can be in the form of trapezoidal beam system 10, 50, thereby form forming a trapezoidal beam bridge 72′. Bridge 72 can consist of trapezoidal beam 12, and guide track 30, wherein the portion of guide track 30 that extends past trapezoidal beam 12 is received in the bridge sleeve 100.

Referring now to FIG. 11 which illustrates the alternate embodiment of the trapezoidal strong back beam system 70 having the bridge 72 consisting of the trapezoidal beam 12 and guide track 30, thereby forming a trapezoidal beam bridge 72′. All the elements and their functions of the above-described trapezoidal strong back beam system 70 are incorporated herein to the alternate embodiment illustrated in FIG. 11.

The trapezoidal beam bridge 72′ consists of the trapezoidal beam 12 and the guide track 30, including all their structural elements as described above.

The displacement arm 92 can be modified to accommodate the trapezoidal beam bridge 72′ therein. The displacement arm 92 is pivotally connected to a bridge sleeve 100, as illustrated in FIG. 11, which, in turn, is securely connected to the guide track 30 of the trapezoidal beam bridge 72′. The bridge sleeve 100 is constructed from steel. Any suitable grade steel, or any other material, could be used in the construction of the bridge sleeve 100. The displacement arm 92 is pivotally connected to the bridge sleeve 100 by two fasteners 102, 104 via displacement arm appendages 106, 108. The fasteners 102, 104 provide a pivotal connection between the displacement arm 92 and the bridge sleeve 100.

The displacement arm 92, sleeve 94 and carriage 80 are identical to that described above in FIGS. 8-10.

Referring now to FIG. 12 which illustrates another alternate embodiment trapezoidal beam bridge 70′ consisting of the trapezoidal beam bridge 72′ and carriage 80′. The trapezoidal beam bridge 72′ includes carriages 80′, only one of which being illustrated. The carriage 80′ is provided for traveling along the parallel guide tracks 30 respectively, as described above in FIGS. 7 and 8. The relationship and configuration of the carriage 80′ and the guide tracks 30 are substantially identical. Therefore, the following description, with reference to FIG. 12, in part, refers only to one carriage 80′. Additionally, the carriages 80′ can be motorized or provided with a motor and drive system.

The carriage 80′, or similar device, is movable along the parallel guide tracks 30 of the trapezoidal strong back beam system 70, and includes at least one mounting plate 82. The mounting plate 82 is configured to travel longitudinally along the parallel guide track 30 by way of rollers 84, 86, 88, 90, which are rotatably mounted to the mounting plate 82. The carriages 80′ bear the weight of the trapezoidal beam bridge 72′ and the crane (not illustrated), which is, in turn, borne by the parallel guide tracks 30. An additional mounting plate 82 may be used external of the profile (I-beam).

Preferably, the rollers 84, 86, 88, 90 include tapered surfaces thereby enabling the rollers 84, 86, 88, 90 to roll efficiently along the guide tracks 30. The rollers 84, 86, 88, 90 include plastic (or rubber) coated rolling surfaces. The plastic coated rolling surfaces are provided to reduce rolling noise of the rollers 84, 86, 88, 90. It is to be appreciated, however, that the rollers 84, 86, 88, 90 need not include plastic coated rolling surfaces. The rollers 84, 86, 88, 90 could instead include, for example, steel rolling surfaces.

The mounting plate 82 includes a safety mechanism in the form of anti-derailment means 82A, 82B. The anti-derailment means 82A, 82B are horizontally mounted wheels or similar, which ensure the carriages 80′ remain engaged with the guide tracks 30 of the trapezoidal strong back beam system 70. The anti-derailment means 82A, 82B are provided to prevent the trapezoidal beam bridge 72′ and crane crashing to the ground in the event of failure of the rollers 84, 86, 88, 90 or other parts of the carriage 80′.

The displacement arm 92 can be modified to accommodate the trapezoidal beam bridge 72′ therein. The displacement arm 92 is pivotally connected to a bridge sleeve 100, as illustrated in FIG. 12, which, in turn, is securely connected to the guide track 30 of the trapezoidal beam bridge 72′. The bridge sleeve 100 is constructed from steel. Any suitable grade steel, or any other material, could be used in the construction of the bridge sleeve 100. The displacement arm 92 is pivotally connected to the bridge sleeve 100 by two fasteners 102, 104 via displacement arm appendages 106, 108. The fasteners 102, 104 provide a pivotal connection between the displacement arm 92 and the bridge sleeve 100. A plurality of set screws 110 are used to secure the guide track 30 of the trapezoidal beam bridge 72′ to the bridge sleeve 100.

The trapezoidal beam bridge 72′ is adapted to receive the trolley 78 therein, with the trolley 78 being supported by the guide track 30 of the trapezoidal beam bridge 72′. The attachment means 76 of trolley 78 thereby received within the opening 74 of the guide track 30 of the trapezoidal beam bridge 72′.

A hanger rod 112 pivotally connects the displacement arm 92 to the mounting plate 82, while and a pair of cables 114 connect the displacement arm appendages 106, 108 to the mounting plate 82. The hanger rod 112 passes through the top of the displacement arm 92, a pivot post bearing 116, and a pivot nut 118. A rolling pin 120 supports the displacement arm 92 to the hanger rod 112.

Referring now to FIGS. 13-15 which illustrates another alternate embodiment trapezoidal strong back beam system 130 consisting of the trapezoidal beam bridge 72′ and carriage 134 which is adapted to travel along parallel I-beams 132 respectively, only one of which being illustrated. The relationship and configuration of the carriage 134 and the I-beams 132 are substantially identical. Therefore, the following description, with reference to FIGS. 13-15, in part, refers only to one carriage 134. The I-beams 132 can be attached to a support structure or a surface (133).

The carriage 134, or similar device, is movable along the I-beams 132 of the trapezoidal strong back beam system 130, and includes at least one mounting plate 136. The mounting plate 136 is configured to travel longitudinally along the parallel I-beam 132 by way of rollers 138, 140, 142, 144 which are rotatably mounted to the mounting plate 136. Rollers 138, 142 are positioned on one web of the I-beam 132, while the rollers 140, 144 are positioned on the other web of the I-beam 132, as best illustrated in FIG. 14. The carriages 134 bear the weight of the trapezoidal beam bridge 72′ and the crane (not illustrated), which is, in turn, borne by the I-beams 132. Additionally, the carriages 134 can be motorized or provided with a motor and drive system.

Preferably, the rollers 138, 140, 142, 144 include deep groove ball bearings 148 thereby enabling the rollers 138, 140, 142, 144 to roll efficiently along the I-beams 132. The rollers 138, 140, 142, 144 include plastic (or rubber) coated rolling surfaces. The plastic coated rolling surfaces are provided to reduce rolling noise of the rollers 138, 140, 142, 144. It is to be appreciated, however, that the rollers 138, 140, 142, 144 need not include plastic coated rolling surfaces. The rollers 138, 140, 142, 144 could instead include, for example, steel rolling surfaces.

The mounting plate 136 includes a safety mechanism in the form of anti-derailment pins 150. The anti-derailment pins 150 ensure the carriages 134 remain engaged with the I-beam 132 of the alternate embodiment trapezoidal strong back beam system 130. The anti-derailment pins 150 are provided to prevent the trapezoidal beam bridge 72′ and crane crashing to the ground in the event of failure of the rollers 138, 140, 142, 144 or other parts of the carriage 134.

The displacement arm 152, which in the configuration of a U-hanger, can be modified to accommodate the trapezoidal beam bridge 72′ therein. The displacement arm 152 is pivotally connected to a bridge sleeve or cross travel hanger plates 156, as best illustrated in FIGS. 14 and 15, which, in turn, is securely connected to a bridge sleeve or bridge sleeve or cross travel hanger 158. The bridge sleeve or cross travel hanger 158 is securely connected to the guide track 30 of the trapezoidal beam bridge 72′. The bridge sleeve or cross travel hanger 158 is constructed from steel. Any suitable grade steel, or any other material, could be used in the construction of the bridge sleeve or cross travel hanger 158. The displacement arm 152 is pivotally connected to the bridge sleeve or cross travel hanger 158 by two fasteners 160 via the bridge sleeve or cross travel hanger plates 156. The fasteners 106 provide a pivotal connection between the displacement arm 152 and the bridge sleeve or cross travel hanger 158. A plurality of set screws 162 is used to secure the guide track 30 of the trapezoidal beam bridge 72′ to the bridge sleeve or cross travel hanger 158.

The trapezoidal beam bridge 72′ is adapted to receive the trolley 78 therein, with the trolley 78 being supported by the guide track 30 of the trapezoidal beam bridge 72′. The attachment means 76 of trolley 78 thereby received within the opening 74 of the guide track 30 of the trapezoidal beam bridge 72′.

The displacement arm 152 is pivotally connected to the 136 by way of a main axle 168. The main axle 168 passes through the mounting plates 136 and is pivotally secured to the mounting plates 136 by washers 170 and lock nuts 172. Main axle spacers 174 are positioned between the mounting plates 136 and a pivot post 178. The displacement arm 152 is pivotally connected to the pivot post 178 via a pivot post bearing 180. Additionally, cables 182 connect the travel hang plates 156 to the main axle 168.

It is to be appreciated that part(s) of the above-described arrangements could be incorporated into existing assemblies. In this respect, Applicant envisages that the arrangements illustrated in FIGS. 7-15 in their entirety or in part, could be incorporated into existing assemblies.

The alternate embodiment trapezoidal strong back beam system 10, 50, 70, 70′, 130 allows for the bridge weight to be reduced by approximately 35%, compared with using RHS beams as a strong back beam.

Furthermore, without the use of the trapezoidal strong back beams 10, 50, 70, 70′, 130, a current 1 tonne 12 meter bridge design weighs 513 Kg. Using the trapezoidal strong back beams 10, 50, 70, 70′, 130 a 2 tonne 12 meter bridge design weighs 440 Kg. It can be appreciated the benefit of using the trapezoidal strong back beam 10, 50, 70, 70′, 130 on bridge cranes.

The alternate embodiment trapezoidal strong back beam systems 10, 50, 70, 70′, 130 of the present invention have been found to at least reduce the incidence of jamming experienced by existing assemblies. Additionally, alternate embodiment trapezoidal strong back beam systems 10, 50, 70, 70′, 130 of the present invention have also been found to require less operator effort to initiate movement of the bridge 72, 72′ along the parallel beams 10, 50, 132 when compared to existing assemblies.

Moreover, the present invention is particularly useful, because it can be relatively easily incorporated into existing assemblies.

While a preferred embodiment of the trapezoidal strong back beam system has been described in detail, it should be apparent that modifications and variations thereto are possible, all of which fall within the true spirit and scope of the invention. With respect to the above description then, it is to be realized that the optimum dimensional relationships for the parts of the invention, to include variations in size, materials, shape, form, function and manner of operation, assembly and use, are deemed readily apparent and obvious to one skilled in the art, and all equivalent relationships to those illustrated in the drawings and described in the specification are intended to be encompassed by the present invention.

Therefore, the foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention. 

1. A trapezoidal strong back beam system for a bridge crane, said trapezoidal strong back beam system comprising: at least one guide attachable to a support structure; at least one carriage associated with said guide and moveable along the length of said guide; a bridge beam attachable to said carriage, said bridge beam having a guide track and a trapezoidal beam, said guide track being attachable to said carriage, said trapezoidal beam being attachable to said guide track; and at least one attachment means associated with said guide track of said bridge beam, said attachment means being adapted to support a lifting device; wherein said trapezoidal beam having a top section, a first side rigidly secured to said top section, and a second side rigidly secured to said top section opposite said first side; wherein said first and second sides taper inwardly toward each other from said top section to said guide track.
 2. The trapezoidal strong back beam system of claim 1, wherein said first and second sides of said trapezoidal beam further comprising a flange opposite said top section, said flanges being rigidly secured to said guide track.
 3. The trapezoidal strong back beam system of claim 1, wherein said guide is a pair of guides parallel to each other.
 4. The trapezoidal strong back beam system of claim 1, wherein said guide is a trapezoidal beam.
 5. The trapezoidal strong back beam system of claim 1 further comprising an end cap attachable to the terminal ends of said trapezoidal beam, and above said guide track.
 6. The trapezoidal strong back beam system of claim 1 further comprising at least one diaphragm stiffener, said diaphragm stiffener being insertable into the interior of said trapezoidal beam.
 7. The trapezoidal strong back beam system of claim 1 further comprising a connection means pivotally connecting said carriage to at least one end of said guide track of said bridge beam, wherein said connection means includes a universal connection to absorb rotational and lateral motions of said bridge beam when a force is applied to said attachment means.
 8. The trapezoidal strong back beam system of claim 7 further comprising a trolley associated with guide track of said bridge beam and movable along said bridge beam, and wherein said attachment means is connected to said trolley.
 9. The trapezoidal strong back beam system of claim 8 wherein said connection means further comprises a displacement arm pivotally connectable to said guide track of said bridge beam and to said carriage.
 10. The trapezoidal strong back beam system of claim 9 wherein said displacement arm is supported on a ball bearing attached to said carriage.
 11. The trapezoidal strong back beam system of claim 10, wherein said carriage further comprising at least one anti-derailment means engagable with said guide track of said bridge beam.
 12. The trapezoidal strong back beam system of claim 11 further comprising at least one bridge sleeve pivotally connectable to said displacement arm opposite said ball bearing, said bridge sleeve being adapted to removably receive said guide track of said bridge beam therein.
 13. The trapezoidal strong back beam system of claim 1 further comprising at least one guide track coupler adapted to connect at least two guide tracks together.
 14. The trapezoidal strong back beam system of claim 1, wherein in said top section having a first top section rigidly secured to said first side, and a second top section rigidly secured to said second side, wherein said first top section being rigidly secured to said second top section.
 15. The trapezoidal strong back beam system of claim 1, wherein said carriage further comprising at least one mounting plate, at least one roller pivotally connected to said mounting plate and adapted to contact said guide, at least one axle attachable to said mounting plate, at least one pivot post pivotally attachable to said axle, and at least one arm pivotally attachable to said pivot post and said guide track of said bridge beam.
 16. A trapezoidal strong back beam system comprising: at least one guide attachable to a support structure; at least one carriage moveable along said beam, said carriage including at least one mounting plate, and at least one roller pivotally connected to said mounting plate and adapted to contact said beam; a trapezoidal bridge beam attachable to said carriage, said bridge beam having a guide track and a trapezoidal beam, said guide track being attachable to said carriage, said trapezoidal beam having a top section, a first side rigidly secured to said top section, and a second side rigidly secured to said top section opposite said first side, wherein said first and second sides taper inwardly toward each other from said top section to said guide track; an end cap attachable to the terminal ends of said trapezoidal beam; at least one diaphragm stiffener, said diaphragm stiffener being insertable into the interior of said trapezoidal beam; at least one attachment means associated with said guide track of said bridge beam, said attachment means being adapted to support a lifting device; a connection means pivotally connecting said carriage to at least one end of said guide track of said bridge beam, wherein said connection means includes a universal connection to absorb rotational and lateral motions of said bridge beam when a force is applied to said attachment means;
 17. The trapezoidal strong back beam system of claim 16 further comprising a displacement arm pivotally connectable to said guide track of said bridge beam and to said carriage, and wherein said carriage further comprising at least one anti-derailment means engagable with said guide track of said bridge beam.
 18. The trapezoidal strong back beam system of claim 17 wherein said displacement arm is supported on a ball bearing attached to said carriage, and further comprising at least one bridge sleeve pivotally connectable to said displacement arm opposite said ball bearing, said bridge sleeve being adapted to removably receive said guide track of said bridge beam therein.
 19. The trapezoidal strong back beam system of claim 16 wherein said carriage further comprising at least one mounting plate, at least one roller pivotally connected to said mounting plate and adapted to contact said guide, at least one axle attachable to said mounting plate, at least one pivot post pivotally attachable to said axle, and at least one arm pivotally attachable to said pivot post and said guide track of said bridge beam.
 20. A trapezoidal strong back beam system comprising: at least one guide attachable to a support structure, said guide is selected from the group consisting of an I-beam and a trapezoidal beam; at least one carriage moveable along said guide, said carriage including at least one mounting plate, and at least one roller pivotally connected to said mounting plate and adapted to contact said guide; at least one axle attachable to said mounting plate; at least one pivot post pivotally attachable to said axle; at least one arm pivotally attachable to said pivot post; at least one bridge sleeve pivotally connectable to said arm opposite said pivot post; a trapezoidal bridge beam having a trapezoidal beam and a guide track, said guide track being removably attachable to said bridge sleeve, said trapezoidal beam having a top section, a first side rigidly secured to said top section, and a second side rigidly secured to said top section opposite said first side, said first and second sides taper inwardly toward each other from said top section to said guide track at least one attachment means associated with said guide track of said bridge beam, said attachment means being adapted to support a lifting device; and at least one trolley associated with said bridge and movable along said bridge, and wherein said attachment means is connected to said trolley. 